The sum of that power minus efficiency losses will be your total power output, and the elevation change, rolling resistance, and your aerodynamics will determine what proportion of that output will be ultimately used for torque versus distance and thus your gear ratio.
No, gear and gain ratios do not affect power. While you are correct in assuming that it would feel different to the rider, if the other three variables are equal, then the power rate will be the same. In this case, in an "easier" gear ratio, the cadence would require a significant increase to maintain the same climb time speed and if the rider is identical, then the work rate is identical. The increase in speed of pedaling makes up the difference in wattage expenditure compared to the "harder" gear at a lower cadence.
Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams?
Learn more. Does gear ratio affect Power? Ask Question. Asked 10 years, 6 months ago. Active 5 years, 10 months ago. Viewed 10k times. Now, my question is: Given the same rider, same bike weight, and same climb-time, does your gearing affect power? Improve this question. Goodbye Stack Exchange BBischof BBischof 1 1 gold badge 2 2 silver badges 5 5 bronze badges.
I also was at a loss for tags here. We don't have a migration path from here to Physics, unfortunately. However, this question can really be asked here or on Physics but I think you'll get a better answer there. I'd be fascinated to see the answer. If you post it there as well, please post a link here as well. Cross-site collaboration will likely produce the best answer to this question. For now I will leave it here, if I don't get the answer I am looking for, I will try to dupe it over there.
I suspect you mean efficiency rather than power, otherwise the question makes no sense. You're lifting the same weight over the same distance in the same time, so the power is the same. From a competition point of view, you probably either want to got faster more power for the same effort, or use less energy for the same climb.
So you're looking at efficiency. For just the bike, no, it does not affect power. However, the human body powering the thing, isn't even remotely linear. Show 3 more comments. Active Oldest Votes. I suspect you mean efficiency rather than power. The whole article is worth reading, and it might pay to browse the index for similar papers.
Improve this answer. I also pull up long sleeves, all the better for cooling. You're going to carry the bottle up, just a matter of whether the water is in you or in the bottle. And many climbs lack a water source at the top. Add a comment. Well, that depends on which "power" you are measuring The various energy loss processes due to flexing, friction etc. When the engine moved into ranges with high rpm's - around - the car would be going kph!
Although this seems very fun, it is highly impractical. This is impractical due to the fact that a car requires a large amount of energy to get moving, so an engine trying to go full speed just as it started up wouldn't generate enough force to move the car. Therefore the car makes use of gears in a transmission, or alternatively a "gearbox", which starts off by using lower gears that generate more force in order to get the car moving, eventually moving up to higher gears that focus on speed.
The same principle of gears applies to bicycles; going uphill requires lower gears in order to supply more force to counter the force of gravity , and once the rider is back on flat land, they can switch to higher gears in order to generate more speed for their bicycle. Fossil Fuels. Nuclear Fuels. Acid Rain. In this figure, the diameter of the gear on the left is twice that of the gear on the right. The gear ratio is therefore pronounced "two to one". If you watch the figure, you can see the ratio: Every time the larger gear goes around once, the smaller gear goes around twice.
If both gears had the same diameter, they would rotate at the same speed but in opposite directions. Understanding the concept of the gear ratio is easy if you understand the concept of the circumference of a circle. Keep in mind that the circumference of a circle is equal to the diameter of the circle multiplied by Pi Pi is equal to 3. Therefore, if you have a circle or a gear with a diameter of 1 inch, the circumference of that circle is 3.
The following figure shows how the circumference of a circle with a diameter of 1. Let's say that you have another circle whose diameter is 0. You'll find that, because its diameter is half of the circle's in the figure, it has to complete two full rotations to cover the same 4-inch line.
This explains why two gears, one half as big as the other, have a gear ratio of The smaller gear has to spin twice to cover the same distance covered when the larger gear spins once. Most gears that you see in real life have teeth. The teeth have three advantages:. To create large gear ratios, gears are often connected together in gear trains , as shown here:. The right-hand purple gear in the train is actually made in two parts, as shown above. A small gear and a larger gear are connected together, one on top of the other.
Gear trains often consist of multiple gears in the train, as shown in the next two figures. In the case above, the purple gear turns at a rate twice that of the blue gear.
The green gear turns at twice the rate of the purple gear. The red gear turns at twice the rate as the green gear. The gear train shown below has a higher gear ratio:. In this train, the smaller gears are one-fifth the size of the larger gears. That means that if you connect the purple gear to a motor spinning at revolutions per minute rpm , the green gear will turn at a rate of rpm and the red gear will turn at a rate of 2, rpm.
In the same way, you could attach a 2,rpm motor to the red gear to get rpm on the purple gear. If you can see inside your power meter and it's of the older style with five mechanical dials, you will see that the five dials are connected to one another through a gear train like this, with the gears having a ratio of Because the dials are directly connected to one another, they spin in opposite directions you will see that the numbers are reversed on dials next to one another.
Both reasons are highlighted below. A lower taller gear ratio provides a higher top speed, and a higher shorter gear ratio provides faster acceleration. Besides the gears in the transmission, there is also a gear in the rear differential. You are sacrificing either torque for top speed, or top speed for torque. The OEM final drives are designed for the specifications of that specific car. If you are upgrading your car, or increasing engine power, the OEM parts of the drivetrain will have a higher failure risk.
Upgrading your drivetrain components is necessary, since a chain is only as strong as its weakest link. In the next blog the differences between Gleason, Klingelnberg and Oerlikon gear shapes and manufacturing will be explained.
0コメント